Research of the selection efficiency of boars of Belarusian meaty and Large White breeds for reproduction and productivity indices was realized in the selection and breeding centre Zadneprovski in the Republic of Belarus. The influence of 25-percentage level of boar selection for sperm production with the dominancy of relative average values of an initial population on statistically significant difference within the limits P less than 0,05-0,001 was proved. Application of an evaluation criterion of animal breeding abilities by the degree of frequency of departures from a population level with a value which reflects the intensity of selection in shares of an average quadratic deviation made it possible to raise the breeding value of boar of both genotypes in accordance with the productive qualities of descendants in comparison with average sizes of populations of two breeds on statistically authentic difference at P less than 0,05-0,001. Decreasing in the studied indicators of efficiency of offsprings concerning initial fatherly forms could be explained by a stronger influence of environment conditions rather than genetic predisposition of genotypes to the given traits

Studying of peculiar features of external conformation of replacement gilts used for the further closing stage of commercial cross breeding as well as for the further productivity of first litter gilts was realized in the conditions of a swine breeding stock-rearing farm of the Republic of Belarus. In the modern zootechnic classification it is reasonable to divide pigs into 3 constitutional types of their external appearance: leptosome, transitional, and oerisome. In the conditions of industrial engineering the replacement pigs and sows of transitive type in comparison with individuals oerisome and leptosome types were characterized by higher productivity: early terms of insemination (on 3,2 and 3,3 days, respectively); livability of stores at weaning stage (on 5,8 and 5%, respectively), higher litter size at weaning stage (on 7,1 and 6,3 kg), higher input share into the basic pig stock (on 4 and 6%), and a yield of a gross of body weight gain of litter at fattening with a view to farrow (on 8 and 10%). Piglets of the transitive type sows were characterized by the steadier parameters of metabolism in comparison with stores of leptosome type sows (there were less frequently encountered the disturbances of infringements of trace mineral and calcium and phosphoric metabolism). On the basis of the realized research there were developed the technical specifications of the Republic of Belarus 600039106.001-2004 Replacement gilts; Manual on appraisal of quality of pigs for repair of herd of a pig-breeding complex; the Technological instruction on herd repair of a pig-breeding complex; production schedules Normalization of reproductive function of replacement pigs in the conditions of a complex

The purpose of research is to study influence of fodder additive Water Trit liquid on dynamics of live weight, natural resistance and determination of an optimal dose for pigs on growing. Thanks to рН decrease of intestines contents and presence of organic acids the additive is applied for disease prevention. Presence of organic acids stimulates the development of useful Lactobacillus micro flora in intestines gleam. From the received data positive influence of the fodder additive on a gain of body weight is visible. In the beginning of experiment the difference in body weight of a control and a trial groups was insignificant and made from 9,2 kg to 9,4 kg in the experimental group, and 9,3 kg - in the control group. In the end of experiment the difference in body weight was essential: 28,6 kg, 30,5 kg, 29,5 kg in the trial groups and 28,05 kg in the control. After application of the fodder additive Water Trit liquid in the trial groups there were noted the raised daily average weight gains: on 2,6% in the second, on 13,4% (P less than 0,05) - in the third and on 8,5% - in the fourth group in relation to control group. For studying of the influence of the fodder additive on animal organism there was carried out the blood testing: phagocytosis, bactericidal activity of blood serum, lysozyme activity of blood serum. Indexes on phagocytal index at animal of the control and trial groups were in the beginning of experiment approximately at one level. At 45-day age the indexes in the second and fourth trial groups were above the control ones on 5,2% and 8,9%, respectively. By the end of the experiment the phagocytal index in all four groups changed insignificantly. At studying of lysozyme activity of blood serum at pigs the given research have shown, that at 30-day age the indexes in the third and fourth trial groups were above the control, and indexes in the first group were above the standard of the control. At 70-day age the highest lysozyme activity of blood serum was in the second trial group and has made +16,0% to the control. It is necessary to notice, that on the 70th day this indicator was above the control in all three trial groups

In the conditions of the Republic of Belarus there was realized a comparative study of meat productivity of mongrel Gereford х black-and-white heifers ad purebred black-and-white heifers in the conditions of different levels of concentrated feedstuff in cattle diets; and determine the most efficient and long-term method of animal breeding for meat. Research results showed that breeding of meaty of hybrids of Gereford х black-and-white heifers of the second generation without using the feeding concentrates in their diets or on using rations with a low rate of feeding concentrates (10-20%) proved to be more effective, than breeding of purebred black-and-white herdmates (for which specific density of the concentrated forages in diets made up 20% through pregnancy). Hybrids on Gereford breed in accordance with meat productivity level surpassed the purebred black-and-white animals. The most considerable results were marked at hybrid heifers with relative density of concentrates in a ration of 20% which in accordance with slaughter weight indexes surpassed the herdmates of black-and-white breed on 39,1 kg or on 23,68%, in accordance with slaughter yield - on 8,2%, in accordance with fresh carcass weight - on 37,9 kg or on 23,8%, in accordance with weight of inner porc - on 1,19 kg or on 20,62%.

In the conditions of the Republic of Belarus there was determined the influence of lactulose of the clinical state of weanling piglets, as well as analysis of its preventive and therapeutic efficacy. For the experimental group of piglets in course of 5 days before weaning the lactulose for administrated daily in combination with feed in course of 5 days in dose of 0,002 gram per kilogram of live weight. In 3-5 days after weaning the diarrhea was stated in 4,1% of experimental piglets. The clinically evident efficiency of application of the synthetic disaccharide was showed in lowering of disbacteriosis level in weaning piglets on 33,7%. Besides, there was analyzed the therapeutic efficacy of lactulose for weaning piglets diseased with gastroenteritis. They were administrated lactulose in dose of 0,03 grams per kilogram of live weight once a day after feeding in course of 7 days. Haematologic and biochemical blood indexes of experimental and control groups of piglets were analyzed. Research results showed that application of lactulose promoted the creation of optimal conditions for beneficial microflora, stimulated its reproduction, suppressed the development of opportunistic pathogens.

In the conditions of the Republic of Belarus there was analyzed the efficiency of application of an adsorbent mycotoxins Toxfin Dry (Belgium) for lowering of toxicity load on broiler chickens. In the course of the study there was given attention to poultry productivity, viability and forage expenses for broiler chickens breeding. There was developed a scheme of Toxfin Dry preparation feeding to broiler chickens. There were presented the results of weighing of control and experimental broiler chickens during the breeding periods; the basic zootechnical indices in the conditions of introduction Toxfin Dry; economic efficiency of its application. Research results showed that introduction of a mycotoxin adsorbent Toxfin Dry into diets of broiler chickens promoted the improvement of digestion and absorption of mixed fodder nutrients in a gastroenteric tract, that in its turn promoted the increasing daily average weight gain on 4,3%, broiler stock viability - on 2,6%; and to decrease the expenses for forages on 13,9%. On the basis of obtained experimental data it was recommended to include the mycotoxin adsorbent Toxfin Dry into rations of broiler chickens as a dry mix with mixed fodder in a dose of 5 g/kg of forage dry matter.

In the conditions of the Republic of Belarus there were analyzed the efficiency of application of a new mineral additive produced of the basis of carnallite brine (the national local raw material) as a part of mixed fodders for feeding of young stock of cattle. There was analyzed its influence on digestibility of a diet nutrients in cattle rations and on animal productivity. Inclusion of carnallite brine in mixed fodders structure for fattening young cattle rendered a positive influence on forage palatability. Forage consumption on a per head basis increased on 5,4%. Optimum dose of addition of carnallite brine in mixed fodder - 0,85%. Feeding of young cattle with the experimental mixed fodders did not render negative influence on hematological indices and physiological condition of animals. Use in young cattle rations of the mixed fodder containing 0,85% of carnallite brine promoted the increasing of nutrient digestibility on 3,4-5,7%. In the conditions of feeding of mixed fodders with other doses of carnallite did not cause any changes in digestibility of nutrients. Feeding of the prepared mixed fodder with 0,85% of carnallite brine to young growth of cattle made it possible to increase the growth energy on 5%.

In the conditions of the Republic of Belarus there were studied the influence of different levels of glucosinolates of rape (Brassica napus) seeds on metabolic processes and productive qualities of lying hens for the determination of an optimal dose of administration into their diets of ground rape seeds of the national Belarusian selection in spite of extraction cakes of other crops. Research results showed that addition into mixed fodder of 8-13% of rape seeds increase in their share in a lying hen diets caused the decreasing of the basic zootechnical indexes and did not render essential influence on production quality. However, introduction 6% rapeseeds into diets of lying hens of commercial stock instead of oil-seed meal of other crops did not render essential negative influence on productive indexes and production quality. Feeding of 6% of rapeseeds in spite of oil-seed meal of other crops in course of ten months of technological use of poultry caused the increasing of total yield of eggs on 2,9%, egg production - on 1,8%, average weight of eggs - on 1,7%. Also, it made it possible to reduce the daily consumption of forage on 2,6%, forage expenditures per 10 eggs - on 5,5% and per kilogram of egg weight - on 5,8%. The obtained results assume the possibility of inclusion into lying hens diets of 6% milled rapeseeds of national selection with a level of glucosinolates up to 44,7 mkmol/g.

In the conditions of the Republic of Belarus there was analyzed the influence of a fodder additive Water Trit liquid on quality of water and productivity of swine. Research results showed that administration of the fodder additive Water Trit liquid on the basis of organic acids promoted the increasing of productivity of pigs on 8,2% (P less than 0,01) in comparison with pigs of a control group. Improvement of biochemical indices of blood at experimental pigs was marked. The optimum dosage of the fodder additive Water Trit liquid was 4 ml/l of consumed water. Application of the fodder additive at feeding of pigs positively influenced on quality of water and promoted the destruction of pathogenic microflora in it. The results of tests of water by chemical indices, dynamics of body weight after application of acidulent; fiber fraction, albuminous factor were showed.

In the conditions of the Republic of Belarus there was developed a method of surgical treatment of servicing bulls with penial tumors including tumor removal by means of gas docker Tail Docker and intravenous 0,5% novocaini solution injection during postoperative stage makes it possible to reduce the duration of surgical operation in 3-4 times, completely remove probability of bleeding, reduce the healing period on the average on 6 days and lower the probability of relapse of tumor.